Pressure bag for tire molds



Aug. 29, 1933;

H. J. WOOCK PRESSURE BAG FOR TIRE MOLDS Filed June 30, 1931 4 Sheets Sheet 1 Fig.1

/III /l/VIIII71 00 INVENTOR H. a. Wooek BY Q .swm

ATTORN EY 'Aug. 29, 1933. wooc I 1,924,530

PRESSURE BAG FOR TIRE MOLDS Filed June so, 1951 4 Sheets-Sheet 2 INVENTOR H- c]. W000]:

Q mm ATTORNEY Aug. 29, 1933. H. J. woocK 1,924,530

PRESSURE BAG FOR TIRE MOLDS I Filed June 30, 1931 4 Sheets-Sheet 3 INVENTOR 13 fl. c]. W000}:

ATTORNEY Aug. 29, 1933. H. J. w ocK 1,924,530

PRESSURE BAG FDR TIRE MOLDS Filed June 30, 1951 4 Sheets-Sheet 4 INVENTOR H. cl. W000]:

ATTORN EY Patented Aug. 1933 PRESSURE BAG FOR TmaMoLns 7 Herbert J. Woock, Lodi, Calif; assignor asap Mold. Corporation, Lodi, Calif.

Application Ju'ne30, 1931.' .Serial No. 547,815 a i 6 Claims; (o1. Isl-45i t a This invention relates to tire retreading with the use of a ,full circle mold, especially one-of thevertical type such asthat shown in my Patent No. l,764,378 datedJune 17, 1930. In the use of; a mold of this nature a flexible and expansible pressure bag is placed insidethe tire, andjin the interests of eflicient results and.

preferably used; since by this system the water' is "both injectedinto andrejected from the bag '16 when desiredu Withthe ordinary type .of intake and outlet tubes (suchas the valve stems. of -tire-tubes) applied to the bag,at the top and bottom respectively, it was found that air was apt .to be trapped in the top of the bag when the water was'pumped in sothat an air pocketwas formed; anda certain amount of water inevitably remained in the bottom of thetire when the bag I .was being emptied while still in place in the tire casingpas is the usual method ofprocedure.

,I have; already recognized this objectionable 4 featureand the adjustable tubular inlet and outlet passage members shown in saidco-pending applicationewere. designedi to overcome them.

The proper-adjustment however of these members requiredconsiderable care and good judgment, whichiwasnot. always used by the operators; Also the insertion ofw the bag into the casing or the removal of the same from the easing; at which time the bag is in a deflated and limber condition, was apt to cause the inwardly projecting and unyielding passage members to :cut into or chafe the; bag as well as interfere somewhat with the ease of manipulation of the has... Y a va 1 v e principal object of my present invention therefore is ,to'retain-the advantages and eliminate the disadvantages of said rigid adjustable passage members, by the provision of flexible passages built into the bag and which yield with the flexing of the same; and so designed that the water can only flow into the bag at the topmost point and similarly will be discharged only from its lowest point. In this manner the formation of air pockets is avoided and all the water is positively withdrawn from the 'bag when it is being emptied. I am also able to use the ordinary form of intake and outlet nipples on the bag, which facilitate making the desired This is done by suitable means, the,

- charge conduits.

at the .top and following its inner contour is a acters of reference on the-drawings and particularly at present toFigs. 1 and 2,,the bag systenifi A further object of the invention is to pro- 7 ducea simple and inexpensive device and yet one which willbe exceedingly effective for the conduits of the Mater/circulating and pumping Q purpose -foriwhich it is designed.

These objects l a'ccomplish by means of such structure and'relative arrangement 'of' parts as willfully appeanby a. perusal of the following specificationandclaimsl 1 j In the drawings similar characters of reference indicate corresponding parts in thefseveral views Fig; 1 atran svers'e section of the bagadapted .for use in a verticalltype mold showing the preferred formof bunt m intake andoutlet pa sage members. r I Fig; 2,is ,a' fragmentary section on;thefline Fig 3isa view similar to Fig. 1 but showing f thearrangement of the passage 'wheni the bagis j intended for. use'in a horizontal type mold. I Fig. 4 is a fragmentary transverse section of-a .bagfor a'vertical type mold showing a modified form of passage arrangement. g 8.;

Fig. 5 is a side elevation of, a bag partlyinsection showing still another modified form ofvpas sage.

Referring now more particularly to thecharwhich is of a standard type in theform of an endless hollow annular ring; {Said bag has in: take and outlet openings .2 vand.3 respectively .at the top and bottom of-the bag Qnitsinner periphery. Outwardly projecting and radially extending stems or nipple 4 and 5 are mountedin permanent connection withv the openings 2 and r 3 respectively for; connection'to supply and dis- These. nipples .aresimilar ,to 5 ordinary ,valvepstems and only extend through the adjacent wall of the bag. i

Extending transversely and radially of the bag flexible passage member 6, preferably of tubular; form and vulcanized or built in the bagthrough out its extent. Atthe bottom the passage communicates withthe intake opening 2', andat the topmost point only is provided on its opposite sides with discharge openings 7. The water 5 forced through theintak'e nipple can therefore only enter the bag at its highest point and the formation of air pockets is avoided.

A similar passage member 8 extendsdown wardly about the bag at the bottom from and designed for use in a vertical type mold in which the axis of the bag, is horizontal and the bag stands upright. The bag shown in Fig. 3 is designed for use in a horizontal mold. In this case of course the axis of the bag 1a is vertical and the intake and outlet nipples 4a and 5a respectively are horizontally disposed and lie in a horiv 7 .ing in the inner periphery thereonand a flexible zontal plane centrally of the height of the bag Openings M from the intake passage 6a are not therefore disposed at the point of greatest. radius of the bag, or opposite the intake nipple, but' at what constitutes the top of the bag when it isv in said horizontal position. Similarly the openings 9a. of the outlet passage 8a are disposed at what is the lowest pointof the bag when the latter is horizontal.

The bag lb'shown in Fig. 4 is designed for vertical type molds only. In this ba'g straight flexible tubular passages 10 and 11 extend radially of the'bag from one side to the other in alinementiwithfth'e intake'and outlet nipples lb and I 5b" and communicate at one end therewith.

through only at the bottom.

These passages .are sealed at their opposite ends tothe inner wall of the bag; the intake passage 10 communicatingwith thebag only at the top.

by means of suitable spaced openings 1 2,'whilethe outlet passage 11 communicateswith the bag only at the bottom by means of openings 13.

" In the bag 1c shownin'Fig. 5 the intake passage between the topmost point of the bag and the intake nipple 4c is formed by transversely yextending partitions or walls 14 secured to or built-into the'bag and 'disposedpnfopposite sides of the nipple. Openings. 15, through said walls 'at'the' top provide communication with the bag. Similarly the outlet passagecommu nicating with the nipple 5c is formed of transverse partitions 16 having openings 17- therev All theabove described forms bers are flexible and yield or flex without similar movements of the bag. No damage is therefore ever done to the bag and .no interference withthe manipulation of the same'is had. It will also be noted that in all types of the passage-members, it makes no difference in practice whichis considered the intakeand which the outlet.

7 This is because the' same relative position of the openings from the passages into the bag is had whether the bag is disposed in the positions described or -is iinverted. The openings into the bag being always in the right position for. proper results, no adjustments on the part of the operator are necessary, and the obtaining of such proper results does not thereof passage memi'ore depend on the judgment of the operatorn' form with the admission of water, and vice Versa.

I claim: I I 1. An expansible annular bag having an openpassage member inside the bag and communicatingwith said opening; and said member be-' ing in the form of a tube disposed radially of the bag and extending from its inner to its outer periphery, and communicating with the bag only adjacent such outer periphery.

' 2. An annular expansible tubefor the reception of a fluid vulcanizing mediumjand'being adapted to rest in a predetermined position when in' use and being provided with an inlet and an outlet in itsQperiphe'ry, a flexible passage memberin communication with the:inlet and having an outlet at thejhighest point within the tube 3. An annular 'expansible tube for the recep tion .of a fluid vulcanizing medium, and being adapted to rest in a predetermined position when in use and being'provided with 'an inlet and an outlet in its periphery, a flexible passage member in communication withthe inlet 7 when thelatter is in its predetermined position ,of use.

and outlet respectively, thatmember Which-.- is in communication with the, inlet/having an outlet at substantially the highest point Within the tube when the latter is-in its position of-use, and'the other member having an inlet from substantially the lowest point Within the tube when the latter is in such position of use.

4. An annular expansible tube tion of a fluid vulcanizing' medium, and being adapted to rest in a predetermined position when in use, a flexible passage member within the tube and adhering toand following'the inner cross sectional contour of the tube one end of the passage member opening into the-tube at a fixed point relative to thepredetermined posi-- tion of use of the tube and the-other end ha'v-' for the receping an opening through the side wall of the 6.'A structure as in claim '4 in which the walls of the passage member are formed integral with the wall of the tube, and are of the same material as that of the tube.

HERBERT J. WoocK: 

